This final grade calculator finds the score you need on a final exam or your course grade after a known final score.
Find the final score your target requires
Use Required final score when you know the course percentage you want. Enter your average over all coursework other than the final, the target percentage, and the final’s weight in the full course. Use Course grade after final when the final score is already known or you want to test a possible score. That direction replaces the target field with the actual or hypothetical final score. The syllabus supplies the final weight. Enter the final’s share of the full course, not its share of an exam category. A target is a numeric percentage; apply your instructor’s letter-grade thresholds separately.
Exclude the final from the current average. A weighted contribution to the full course is a different quantity.
Read the syllabus weight for the whole course. A share within an exam category does not replace that weight.
Separate your current average from its course contribution
An 87% average over non-final work and a final worth 20% give a 69.6 percentage-point contribution before the final. The current average is 87%, not 69.6%. For a 90% course target, the required final score is 102.00%.
The equation is (90 − 87 × 0.80) ÷ 0.20. All remaining non-final coursework must already be fixed. A gradebook that includes an ungraded final as zero gives a different input; obtain the average with the final excluded. The Grade calculator can normalize graded category weights.
Calculate your course grade after the final
With the same 87% non-final average and 20% final weight, an 80% final produces a course grade of 85.60%. The contribution from the final is 80 × 0.20, added to 87 × 0.80. This forward direction uses the same weighted equation as the required-score direction.
If several projects and an exam remain, the required-score equation can find their combined weighted average only when you replace the final weight with their combined full-course weight and every other component is fixed. It does not give a separate required score for each task. Use the Semester Grade calculator for marking-period scores and weights.
Interpret secured and unreachable targets
The ordinary course-grade range shown in the details uses a 0–100% final. A signed requirement at or below 0 means a zero final still reaches the target under this equation. The primary result shows 0%, while the exact API requirement preserves the signed value. Calculation details and numeric API values are rounded. A requirement above 100% needs an instructor-approved extra-credit policy or a lower target. This tool does not promise that extra credit is available.
Feasibility uses the exact requirement. A value just above 100% can round to 100.00% on the page while remaining classified as above 100%; check the calculation and exact ratio rather than treating the rounded value as a grading threshold. No school rounding rule is applied.
A final with 100% course weight makes the non-final contribution zero. A zero final weight cannot solve a required final score and is rejected in both directions. Local input limits are 150% for grade inputs, 100% for final weight, and a minimum positive value of 0.000000000001. Inputs allow 64 characters, up to 12 decimal places and exponent magnitudes up to 12; API simple-fraction components allow up to 15 digits. These are calculator limits, not instructor policies. API numbers round to four decimal places; page percentages round directly to two. Exact required-score and resulting-course ratios are also returned.
This equation does not replace another test inside an exam category or model a multipart final, dropped work, grading curves or instructor bonus caps. RogerHub’s advanced policy modes cover some of those different situations; this page keeps the fixed-weight course equation explicit. To calculate a single assessment percentage, use the Quiz Grade calculator.